@newton All around your gear looks incredible.(just started working on my barb so I look in no fit shape to be telling you what to improve) But if I were you I would spend more money on that ammy and try to get something that has more crit dmg as well. that should get you closer to 150-175k dps.
As a two hander I am trying to figure out what skills will help me survive higher end monster power. Should I be putting more into crit or life leech when I buy new rings, wrists and an ammy?
as for ammy : not very important to chance it , i can farm mp10 solo without problems , so i guess it would be useless to change it .
rings : well depends on your build . i usally mass str cc ch , but some of my friends mass vita, armor , AR ( don't ask me why i don't know :D )
ANSWER TO YOUR POST : <
well my gear are NOT the BEST you can have but it have all the affix a barbarian needs.
it's important to gain this goal for a decent barb build
500dex ( dodge chance is important )
1000+ vita .
for armor : getting 6.5 to 7k def his perfect . having more doesnt rly makes a HUGE diff.
as to farm MP5 you will need theses stats
800+ all resist
12% life steal or 9% if you do over 100k unbuff. ( i use 12% when i do mp9-10 or ubers )
speed is important , when i farm mp1 i use lacuni,tyrael and mov.s boots so has Hurricaine WW.
(Concerning the latest patch : barb nerfing was pretty noticable : cuz when you face a minion 1v1 well your barb suck. PERIOD! i do over 380k buff wotb so i know the !@#$ im saying)
so you might ask : WHY MP1 .
well let's just say it's the most efficient xp/hr so has elites kills/hr . mp1 or mp0 a3 turns all monster to ilvl 63 . monster power actually makes the game harder ... IT DOESNT GIVE BETTER DROPS PERIOD!